Breech mechanism for automatic firearms.



To allwlwmz'mayconcem: j j j i Be it known thatI, HUeoqBoRonARDT, ab citizen"` `of the United il States of America,` `residing at 31 Kantstrasse,Charlottenburg `near Berlin, in the Empire of Germany,` i i `have invented certain new {anduseful 11n-f* `provementsin Breech. Mechanism for Automatic Firearms, of which thefollowing is a specification.

The object of the invention is to rovide `a breech mechanism for automatic` rearms*` allowing of its automatic operation even *when blank cartridges are .i being used. In

j this connection it `has already i been j prof `posed to increase the "gas pressure `by using a choked barrel or choked blank `cartriolga?, shells. l.

j blank cartridgesb displacing `or altering the breeches mem ers. In l an automatic j firearm having a toggle breech this can be effected, for instance, by insertin, between `the toggle joint and the breech casing a" liftj ing block whichbearsupon thefwallof .the

\ casing so astolift or partly breakthe joint. "A constructional form `embodying the vention is represented inthe accompanying drawing,in which: i

Figure 1 `is a longitudinal view, partly in section, Fig..2 is aperspectiveview "of the lifting block, Figs."3 and aaretwo vertical transverse sections takenthrough themiddle hinge of the toggle joint, showing respectively the `lifting block in place and the same omitted.

The recessed middlehinge cof-the two arms a b of the toggle joint" bears. directly onthe wall of the `breechcasing fg, when the toggle joint so as to bear onthejwall of the breech casing g. l .Y The lifting block d partly breaksthe toggle joint `by raising "the `middle hinge4 slightly above the position which "it assumes under normal conditions. The` elevation of the toggle jointisclearly shown in Fig.

3 in which the lifting `block `d` is i inserted in inserting theliftingblockfthe work` to be effected by the gas pressure `ist decreased* joint.

` l j h extent.thatithehantoniatic opera- `.tion of the `firearm cantale placein the flsamefmanneras when" ball cartridges are used.""\\ .j

The liftingblock` al (Fig. 2) is provided onaformed `with an upper resilient spur 6 ters `Patent of theUnited States is: j 1. `le. Breech `mechanism for automatic iirejarnis` comprising a breech block, a breech {jcasingfa toggle joint connectingsaid breech j j i i j block with `said breech casing, and detach- According to the inventionthe problem, is solved by ydecreasing the work-,tobe ef" fected by the gas pressure whenshooting,`

able means disposed `between said breech 2. Breech mechanism for automatic ire- `arms comprising a breech block, a breech casing, a toggle joint connecting said breech block: with said `breech casing, and detacharms comprisinga breech block, a breech casing, a'togglerjoint connecting said breech block with said breech `casing,and detachable means inserted `in `the toggle joint and bearing `upon the wall of said breech casing and adapted to 1 partly break said `toggle 4. Breech mechanism for automatic lirei able; means bearing upon the wall oi` said arms .comprising a breech block, a breech casing, a toggle joint connecting saidfbreech block with said breech casing. and detachr `able means" disposed betweensaidrbreech casthe firearm is being usedwith ball car- `tridges. When blank cartridges are to be ing land the middle hinge of saidftoggle joint 1 andadaptedtolift `said middle hinge.` `employed a lifting blockfd` is `inserted in 5. Breech` mechanism "for automatic firearmscomprising a breech block, a breech casing, a togglejoint connecting `said breech block with saidbreech casing, and a detach- `able i lifting block `disposed between said `breech `casing and said toggle joint forv increasing the angle of opening of said toggle joint'.`

Gpreechfmechanism for automatic ire-` armsfcomprismg a breechblock, j a breech "casing, atogglejoint `connecting said breech :block with saidbreech casing, and a detachable lifting "block disposed between said .r casing and said toggle joint" and j yieldingly block engaging Seid; reessgsubstantelly for* ,HUGO BORGHARDT;fgf;i VVtnesses:I` u 1 A l A ROBERT MIGHELSKY, 

